Reactive power compensation integrated box of low-voltage distribution transformer

Abstract

The invention discloses a reactive power compensation integrated box of a low-voltage distribution transformer, which comprises a box body. The box body comprises a switch room and a capacitance room which are arranged in parallel, wherein a measurement sampling current transformer, a knife fuse switch, a compensation sampling current transformer and a leakage comprehensive protection switch device are arranged inside the switch room, and a capacitance compensation device and a measurement terminal are arranged inside the capacitance room. In addition, the reactive power compensation integrated box also comprises a switching automatic control unit which is respectively connected with the measurement sampling current transformer, the compensation sampling current transformer and the capacitance compensation device. By combining the function of overload protection, short circuit protection, current leakage protection, phase-failure protection, zero line-failure protection, reactive power compensation measurement, low-voltage separation, a watt-hour meter, a load measuring and recording instrument and the like, the invention effectively solves a series of problems encountered in installing a plurality of single-function devices at the low-voltage side of a bench type distribution transformer, and has the advantages of enhancing the safety and reliability of the low-voltage side of the bench type distribution transformer and reducing comprehensive cost.

Description

technical field [0001] The invention relates to a smart grid low-voltage distribution transformer reactive power compensation integrated box. Background technique [0002] At present, outdoor distribution boxes suitable for the low-voltage side of urban and rural public transformers in China have the following disadvantages: First, they have single functions and are only used as line grids, which cannot improve power factor, improve voltage quality, and reduce line loss; The failure rate is high. The traditional knife-fuse isolating switch cannot open with load, and can only perform the opening and closing functions under no-load conditions, and its reliability is not high. , with the end of the transformation of urban and rural power grids, with the widespread application of integrated automation substations and the remote operation requirements for substations at the remote end of the centralized control center, it is urgent to improve the existing distribution boxes and d...

AI Technical Summary

Problems solved by technology

[0002] At present, outdoor distribution boxes suitable for the low-voltage side of urban and rural public transformers in China have the following disadvantages: First, they have single functions and are only used as line grids, which cannot improve power factor, improve voltage quality, and reduce line loss; The failure rate is high. The traditional knife-fuse isolating switch cannot open with load, and can only perform the opening and closing functions under no-load conditions, and its reliability is not high. , with the end of the transformation of urban and rural power grids, with the widespread application of integrated automation substations and the remote operation requirements for substations at the remote end of the centralized control center, it is urgent to improve the existing distribution boxes and design a A smart grid type distribution transformer reactive power integrated box with powerful functions, high reliability and high degree of automation

Images